Gay is waiting for the results of his B sample from the United States Anti-Doping Agency having reportedly been tested positive for a banned substance.

The 30-year-old said last night: “I basically put my trust in someone and I was let down. Sometimes a human being naturally trusts somebody. That’s what people do.”

In the meantime, the sportswear giant has invoked a clause in its contract dealing with doping.

Adidas said in a statement: "adidas and Tyson Gay have been partners since 2005 and during this time he has been a great ambassador for the sport of track and field and our brand.

(Image: Stu Forster)

"We are shocked by these recent allegations, and even if we presume his innocence until proven otherwise, our contract with Tyson is currently suspended.

"Adidas has a clear policy on doping and drug use - each of the agreements with our athletes include a clear clause which states that the agreement shall be terminated by adidas if the athlete is found guilty of the possession or use of drugs or any other prohibited substance by the relevant governing sports body having jurisdiction over the athlete."